Adjustable armchair



FIG. 1 is a front perspective view of an ajustable armchair showing my new design;

FiG. 2 is a top plan view of the adjustable armchair of FIG. 1;

FIG. 3 is an elevation side view of the adjustable armchair of FIG. 1;

FIG. 4 is a front elevation view of the adjustable armchair of FIG. 1; and

FIG. 5 is a bottom plan view of the adjustable armchair of FIG. 1. 

The ornamental design for an adjustable armchair, as shown. 